    001/*
    002 * Licensed to the Apache Software Foundation (ASF) under one or more
    003 * contributor license agreements.  See the NOTICE file distributed with
    004 * this work for additional information regarding copyright ownership.
    005 * The ASF licenses this file to You under the Apache License, Version 2.0
    006 * (the "License"); you may not use this file except in compliance with
    007 * the License.  You may obtain a copy of the License at
    008 *
    009 *     http://www.apache.org/licenses/LICENSE-2.0
    010 *
    011 * Unless required by applicable law or agreed to in writing, software
    012 * distributed under the License is distributed on an "AS IS" BASIS,
    013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    014 * See the License for the specific language governing permissions and
    015 * limitations under the License.
    016 */
    017package org.apache.commons.configuration2.tree;
    018
    019import java.io.PrintStream;
    020import java.util.Map;
    021
    022/**
    023 * Utility methods.
    024 *
    025 * @version $Id: TreeUtils.java 1842194 2018-09-27 22:24:23Z ggregory $
    026 * @since 1.7
    027 */
    028public final class TreeUtils
    029{
    030    /** Prevent creating this class. */
    031    private TreeUtils()
    032    {
    033    }
    034
    035    /**
    036     * Print out the data in the configuration.
    037     * @param stream The OutputStream.
    038     * @param result The root node of the tree.
    039     */
    040    public static void printTree(final PrintStream stream, final ImmutableNode result)
    041    {
    042        if (stream != null)
    043        {
    044            printTree(stream, "", result);
    045        }
    046    }
    047
    048    private static void printTree(final PrintStream stream, final String indent, final ImmutableNode result)
    049    {
    050        final StringBuilder buffer = new StringBuilder(indent).append("<").append(result.getNodeName());
    051        for (final Map.Entry<String, Object> e : result.getAttributes().entrySet())
    052        {
    053            buffer.append(' ').append(e.getKey()).append("='").append(e.getValue()).append("'");
    054        }
    055        buffer.append(">");
    056        stream.print(buffer.toString());
    057        if (result.getValue() != null)
    058        {
    059            stream.print(result.getValue());
    060        }
    061        boolean newline = false;
    062        if (!result.getChildren().isEmpty())
    063        {
    064            stream.print("\n");
    065            for (final ImmutableNode child : result.getChildren())
    066            {
    067                printTree(stream, indent + "  ", child);
    068            }
    069            newline = true;
    070        }
    071        if (newline)
    072        {
    073            stream.print(indent);
    074        }
    075        stream.println("</" + result.getNodeName() + ">");
    076    }
    077}